The CampusGIS of the University of Cologne can be seen as a pilot application for university campus environment. It is a geographic information system (GIS) that allows the online-search for persons, buildings and facilities. The results of the queries are enhanced with spatial information. It improves the orientation on campus by using geodata services. In addition to standard GIS applications like �identify� and �select by attributes� or �select by location� CampusGIS also provides routing applications for pedestrians and handicapped persons. In combination with positioning functionalities CampusGIS-Mobile can provide location-based services. This is essential for the CampusGIS, particularly due to the rising mobility of our society and the affinity of the younger generation to mobile devices. As location-based service tool CampusGIS also provides technical building drawings. The extension CampusGIS-3D visualizes the university buildings in three dimensions. The module CampusTours provides virtual tours of the University of Cologne with additional thematic background information given at about seven to ten points of interest. Campus based geodata was surveyed, digitised, and added to the ATKIS-street dataset (ATKIS = authoritative topographic cartographic information system of the Federal Republic of Germany). The combined data is managed and maintained in a geodatabase. Alphanumerical information about persons, facilities and buildings, provided by the university administration in relational databases, is connected to the spatial entities within that online GIS environment. The system is designed modularly, so established applications can be extended at any time. This thesis describes the design and development of the CampusGIS. After the introduction the basics of GIS, internet and the resulting WebGIS are shown. Based on this the spatial services provided by WebGIS are surveyed, focusing on the capabilities of spatial applications in the campus environment. Collecting, storing and managing of Campus based geodata are described. The methods and mathematical algorithms to determine the answer to spatial requests are discussed. Furthermore it is shown how the results are visualised and presented in a web browser. In addition to that detailed description of the CampusGIS development, the system is compared with similarWebGIS of other universities and their approaches are discussed. Finally the system is evaluated.